[meteorite-list] Acfer breccia

[Rob Lenssen]

Thank you very much for your reaction Bernd.

Like I wrote before, it was covered in desert varnish when I got it. The two 
polished planes present fractured sides, that I planed removing as less 
material as possible. Before planing they already showed dark "lumbs". Like 
it fractured "around them".
Don't think it is planetary though, as it is magnetic and shows the typical 
(chondrite) dots of iron in the surface.

I will try to make better pictures and will share them with you.

regards,
Rob

----- Original Message ----- 
From: <bernd.pauli at paulinet.de>
To: <Meteorite-list at meteoritecentral.com>
Sent: Tuesday, January 16, 2007 10:32 PM
Subject: Re: [meteorite-list] Acfer breccia


Hello Rob L. and List,

Look what I found after cleaning and polishing a desert varnish covered 
Acfer:

http://home.planet.nl/~rlenssen/Acfer500g.htm

Dark clasts in lighter matrix. Also metal spots in the dark clasts.
Any idea what this might be? In chondrites I typically see lighter
clasts in darker matrix.


What a beautiful Açfer chondrite! Is it a chondrite after all? The pictures 
should
have a higher resolution. Are there any chondrules? Questions, questions, 
questions!

Anyway, it does look quite fresh, so it should be something like W1 or W2 at 
most.
It does look highly shocked ... at least S4 but more probably S5 or even S6. 
Well,
that sounds like silicate darkening. Maybe the silicate clasts were not so 
very dark
prior to the shock event but experienced extensive darkening (caused by 
melting of
metal-sulfide).

As for: "In chondrites I typically see lighter clasts in darker matrix"

Here are some chondrites that have dark inclusions: NWA 0869, NWA 0978,
NWA 1794, NWA 3346, OUED EL HADJAR, RICHFIELD, TANEZROUFT 061, etc., etc.

Anyway, a mighty beautiful "chondrite", something that, as Dean would now 
say
"you just gotta love!" ... and if it is not a chondrite ??? Could this be a
planetary meteorite??? Questions, questions, questions!

Cheers,

Bernd




To: rlenssen at planet.nl
    Meteorite-list at meteoritecentral.com

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